A. Partial breakdown of air
B. Complete breakdown of air
C. Sparking between lines
D. None of these
Ans: B
A. Corona takes place at a voltage lower than breakdown voltage
B. Corona takes place at a voltage higher than breakdown voltage
C. Corona is a current phenomenon
D. Corona increases the transmission line efficiency
Ans: A
A.Violet visible discharge in darkness
B. Hissing sound
C. Vibration
D. Power loss
E. Radio interference
F. Ozone
G. All of the above
Ans: G
A. Presence of ozone detected by odour
B. Hissing sound
C. Faint luminous glow of bluish colour
D. All of the above
Ans: D
A. Decrease in conductor size and increase in supply frequency
B. Increase in conductor size and decrease in supply frequency
C. Increase in both conductor size and supply frequency
D. Decrease in both conductor size and supply frequency
Ans: A
A. Increase the lie carrying capacity due to conducting ionized air envelope around conductor
B. Increase the power factor due to corona loss
C. Reduce the radio interference from the conductor
D. Reduce the steepness of surge fronts
Ans: D
A. The current density is reduced
B. The eddy current in the conductor is eliminated
C. For a given cross section, the radius of the conductor is increased
D. Of better ventilation in the conductor
Ans: C
A. Surface electric stress of conductor
B. Increases the line reactance
C. Decrease the line capacitance
D. All
Ans: A
A. Diameter of the conductor
B. Material of the conductor
C. Height of the conductor
D. None
Ans: A
A. Have high potential difference
B. Are closely spaced
C. Carry dc power
D. Both A and BAns: D
Humankind has become extremely dependent on electricity, without it we can’t run the household, keep…
[1] Define the term synchronous speed [Dec-2003] For synchronous machines there exists a fixed relationship…
We shared a lot of interview questions on electrical machines, power system and power electronics. Today we…
DIESEL POWER STATION A generating station in which diesel engine is used as the prime…
Q:Why syn. generators are used for the production of electricity? A:synchronous machines have capability to…
Hydro-electric Power Station A generating station which utilises the potential energy of water at a…